You have to get all the [b] original achievements[/b] to keep it. Here's a list: [quote] - Landfall Finish the first mission of the Campaign on Normal, Heroic, or Legendary. -Holdout Finish the second mission of the Campaign on Normal, Heroic, or Legendary. -The Road Finish the third mission of the Campaign on Normal, Heroic, or Legendary. -Cleansing Finish the fifth mission of the Campaign on Normal, Heroic, or Legendary. -Refuge Finish the sixth mission of the Campaign on Normal, Heroic, or Legendary. Last Stand Finish the seventh mission of the Campaign on Normal, Heroic, or Legendary. -Campaign Complete: Normal Finish the Campaign on Normal. -Campaign Complete: Heroic Finish the Campaign on Heroic -Campaign Complete: Legendary Finish the Campaign on Legendary -Iron Find and claim this skull when playing on Normal, Heroic or Legendary difficulty. -Black Eye Find and claim this skull when playing on Normal, Heroic or Legendary difficulty -Tough Luck Find and claim this skull when playing on Normal, Heroic or Legendary difficulty. -Catch Find and claim this skull when playing on Normal, Heroic or Legendary difficulty. -Fog Find and claim this skull when playing on Normal, Heroic or Legendary difficulty. -Famine Find and claim this skull when playing on Normal, Heroic or Legendary difficulty. -Thunderstorm Find and claim this skull when playing on Normal, Heroic or Legendary difficulty. -Tilt Find and claim this skull when playing on Normal, Heroic or Legendary difficulty. -Mythic Find and claim this skull when playing on Normal, Heroic or Legendary difficulty. -Graduate Earn 5 EXP or finish 10 games to complete the requirements for basic training -UNSC Spartan Earn your Sergeant rating to be recognized as a true Spartan. -Spartan Officer Advance to the Spartan Officer ranks -Two for One Score a Double Kill with a single spartan laser shot in a ranked free for all playlist -Triple Kill Kill 3 enemies within 4 seconds of one another in a ranked free for all playlist -Overkill Kill 4 enemies within 4 seconds of one another in a ranked free for all playlist. -Lee R Wilson Memorial Score 5 grenade sticks in any ranked free for all playlist -We're in for some Chop Destroy an enemy vehicle with equipment in a ranked playlist or in campaign. -Killing Frenzy Kill 10 enemies without dying in any ranked free for all playlist. -Steppin' Razor Score a Triple Kill with the sword in a ranked free for all playlist -Up Close and Personal Kill 5 enemies by melee or assassination in a ranked free for all playlist -Fear the Pink Mist Kill 5 enemies with the needler in a ranked free for all playlist or in campaign. -Headshot Honcho Kill 10 enemies with headshots in a ranked free for all playlist or in campaign. -Used Car Salesman Destroy a vehicle that has three enemies in it in a ranked playlist or in campaign. -MVP Earn the MVP in any ranked playlist -Maybe Next Time Buddy Board the same vehicle within 10 seconds after being boarded in any free for all playlist. -Marathon Man Locate and access all Terminals in the Campaign. -Guerilla Score over 15,000 points in the Campaign meta-game on the first mission. -Demon Score over 15,000 points in the Campaign meta-game on the second mission -Cavalier Score over 15,000 points in the Campaign meta-game on the third mission. -Askar Score over 15,000 points in the Campaign meta-game on the fourth mission -Exterminator Score over 15,000 points in the Campaign meta-game on the fifth mission. -Ranger Score over 50,000 points in the Campaign meta-game on the sixth mission. -Vanguard Score over 50,000 points in the Campaign meta-game on the seventh mission. -Orpheus Score over 15,000 points in the Campaign meta-game on the eighth mission. -Reclaimer Score over 15,000 points in the Campaign meta-game on the final mission. [/quote]